Identify the term that will replace the ?
$31, 29, 24, 22, 17, ?, ?$

15, 13

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10, 8

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14, 12

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15, 10

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Solution

The correct option is C $15, 10$
Option D is the correct answer
Explanation:
Following series is alternating subtraction series, which subtracts $2$ and then $5$ .
$31 - 2 = 29$
$29 - 5 = 24$
$24 - 2 = 22$
$22 - 5 = 17$
Hence following the serie next numbers will be
$17 - 2 = 15$
$15 - 10 = 5$
Hence $15, 10$ is the correct answer

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